Math Problem Statement
Solve the system of equations: 3x - 8y = 4 and -5x + 6y = 8
Solution
The system of equations given in the image is:
3x - 8y &= 4 \quad \text{(Equation 1)} \\ -5x + 6y &= 8 \quad \text{(Equation 2)} \end{aligned}$$ To solve this system, we can use either the substitution or the elimination method. Here, I'll use the elimination method. ### Step 1: Multiply the equations to eliminate one variable Let's aim to eliminate $$x$$. To do this, we need to make the coefficients of $$x$$ in both equations equal. Multiply Equation 1 by 5 and Equation 2 by 3: $$\begin{aligned} (5) \cdot (3x - 8y) &= (5) \cdot 4 \quad \Rightarrow \quad 15x - 40y = 20 \quad \text{(Equation 3)} \\ (3) \cdot (-5x + 6y) &= (3) \cdot 8 \quad \Rightarrow \quad -15x + 18y = 24 \quad \text{(Equation 4)} \end{aligned}$$ ### Step 2: Add the equations to eliminate $$x$$ Now, add Equation 3 and Equation 4: $$(15x - 40y) + (-15x + 18y) = 20 + 24$$ Simplifying: $$0x - 22y = 44 \quad \Rightarrow \quad -22y = 44$$ ### Step 3: Solve for $$y$$ $$y = \frac{44}{-22} = -2$$ ### Step 4: Substitute $$y = -2$$ into one of the original equations Substitute $$y = -2$$ into Equation 1: $$3x - 8(-2) = 4 \quad \Rightarrow \quad 3x + 16 = 4$$ Now, solve for $$x$$: $$3x = 4 - 16 \quad \Rightarrow \quad 3x = -12 \quad \Rightarrow \quad x = \frac{-12}{3} = -4$$ ### Solution: The solution to the system of equations is: $$x = -4, \quad y = -2$$ Would you like more details on any part of this solution, or do you have further questions? --- Here are 5 related questions to explore: 1. What is the substitution method for solving systems of equations, and how does it differ from elimination? 2. How can you verify the solution to a system of equations? 3. What happens if a system of equations has no solution or infinitely many solutions? 4. Can systems of equations be solved graphically, and how does this compare to algebraic methods? 5. What is a real-world example where systems of equations might be applied? **Tip:** When solving systems of equations, always check your solution by substituting the values back into the original equations.Ask a new question for Free
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Math Problem Analysis
Mathematical Concepts
Algebra
Linear Equations
System of Equations
Elimination Method
Formulas
3x - 8y = 4
-5x + 6y = 8
Theorems
Method of Elimination
Suitable Grade Level
Grades 8-10
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